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Thread: E30 325i wont start help !!

  1. #1
    Join Date
    Sep 2018
    Location
    SK
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    My Cars
    E30 325i

    E30 325i wont start help !!

    I have a Euro market 86 325i that will start if I spray starting fluid, but wont start on gas.
    Here's what I've done so far to troubleshoot.

    - If I spray starting fluid into the intake while cranking, it starts and runs.
    - Wont start trying to start on fuel pump. cranks well, but wont start.
    - Fuel pressure is good, also tried new pump from a running car and the pressure is still good.
    - changed out spark plugs
    - Replaced injectors, fuel rail and fuel pressure regulator from a running car and still wont start.
    - Spark is good.
    - Checked injector pulse with a bulb and it pulses as it should.

    It cranks strong but it wont start at all. any idea what else I should be looking at ?

    Update May 20
    - Pulled the injector rail, connected the injectors and plugs on the rail outside the engine and all injectors sprayed/pulsed perfectly while cranking. No issue here as I could physically see all 6 injectors spraying.
    - Also swapped the ignition coil to a known working one, and still no start.
    Last edited by utterson; 05-20-2019 at 12:39 PM.

  2. #2
    Join Date
    Mar 2007
    Location
    Joliet,IL
    Posts
    795
    My Cars
    87 325is 96 GMC Suburban
    Do you have access to the DME from the running car to swap as well?

  3. #3
    Join Date
    Dec 2005
    Location
    corpus christi, texas
    Posts
    4,566
    My Cars
    only the kids e30s
    where are you? there is not an 86 325i here in the usa so I am not sure if yours is a 325i or if its a 325e? if you are not in the us market, find whichever sensors tells the injectors to fire, be it the crank sensor, or what. if its a 325e, check the sensors in the transmission bell housing. one of those being bad will make your car not spray fuel when cranking

    - - - Updated - - -

    also, look in the oil cap and make sure your timing belt is not broken. look for the valves to move. that will make it not start, also
    no e30s of my own, but I am financing two for my kids

  4. #4
    Join Date
    Sep 2018
    Location
    SK
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    6
    My Cars
    E30 325i
    Quote Originally Posted by msservices View Post
    Do you have access to the DME from the running car to swap as well?
    DME wont swap over as the non running car has a smaller ECU with 2 rows of pins while the running car is an 88 and has 3 rows of pins.

    - - - Updated - - -

    Quote Originally Posted by superj View Post
    where are you? there is not an 86 325i here in the usa so I am not sure if yours is a 325i or if its a 325e? if you are not in the us market, find whichever sensors tells the injectors to fire, be it the crank sensor, or what. if its a 325e, check the sensors in the transmission bell housing. one of those being bad will make your car not spray fuel when cranking

    - - - Updated - - -

    also, look in the oil cap and make sure your timing belt is not broken. look for the valves to move. that will make it not start, also
    injectors are firing - confirmed using noid light and by pulling injectors and fuel rail and connecting externally and can physically see fuel being sprayed.
    If the timing belt is broken, it wouldn't run when I spray starter fluid. Car idles well when I spray starter fluid.

  5. #5
    Join Date
    Mar 2007
    Location
    Joliet,IL
    Posts
    795
    My Cars
    87 325is 96 GMC Suburban
    Taking the injectors out and connecting them externally was a great idea but that leads me to suspect the quality of the fuel Or a connection issue in the harness going to the injectors

  6. #6
    Join Date
    Dec 2005
    Location
    corpus christi, texas
    Posts
    4,566
    My Cars
    only the kids e30s
    Duh, you are right. Won't run on spray with broken belt.

    Our 325e wouldnt run with a bad crabk sensor but would run on spray. Thats the only thing i can think of right now
    no e30s of my own, but I am financing two for my kids

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